Terms and Conditions

This is a translation for your convenience; the German version applies.

Licence purchase and renewal for Glassbird Pro, Pro and Business plans

1. Scope and contracting party

These terms apply to the purchase of licences for the Thunderbird add-on Glassbird Pro through the order page on glassbird.app, as a Pro licence or a Business licence (together “licence”), and to the renewal of a Pro licence (section 9(4)).
Your contracting party is DMRC.IT, proprietor Dominik De Marco, Speicherstraße 100, 44147 Dortmund, Germany, phone +49 231 93149327, email glassbird@dmrc.it (“we”). You can also reach us at these details with questions and complaints.
These terms apply to consumers and businesses. You are a consumer if you buy for purposes that are predominantly outside your trade, business or self-employed profession. You are a business if you buy in the exercise of your trade, business or self-employed profession. What applies only to businesses is set out in section 13.
The free theme Glassbird is open source and separate; it is governed solely by its open-source licence.
Where the licence notice in the add-on (the LICENSE file) differs from these terms, these terms take precedence for purchased licences.

2. What you buy

You buy a licence key. It unlocks the Pro features in the add-on Glassbird Pro and, with a Business licence, also the Business features for telephony and CRM. You get the add-on itself free of charge through glassbird.app or, once it is listed there, through addons.thunderbird.net, Mozilla's add-on service; the companion add-on only through glassbird.app. Glassbird Pro is digital content; there is no physical medium.
The features included are those in the product description on glassbird.app at the time of your order; the contract confirmation lists them. Some features also need the free companion add-on Glassbird Pro Experiments.
System requirements: Thunderbird for desktop computers from version 153 and an internet connection to activate the licence key and have it checked at least every 90 days (section 3(5)). The product description and the contract confirmation state which Thunderbird versions the companion add-on currently supports. Thunderbird for smartphones and tablets is not supported.
Where add-ons by other providers replace parts of the Thunderbird interface, some features of Glassbird Pro do not appear there or appear only with the companion add-on. At present this affects Translate, Notes and Unsubscribe in the view of the add-on Conversations: they appear there only with the companion add-on.
Glassbird Pro is currently offered as a beta: its range of features is still growing, and we fix errors promptly through updates during the update period (section 9). This does not limit your statutory rights in the event of defects.
Some features work with services you choose yourself, for example an AI provider, your Nextcloud or a DNS service; for some you need your own account there. We owe that, when provided, Glassbird Pro works with these services as the product description states; after that, section 9 applies. The services themselves, their availability and their results, such as the texts of an AI, are not part of our performance; their providers' terms apply to them.
For holders of a licence key we also operate an unsubscribe relay (relay.glassbird.app). If your network blocks a newsletter's unsubscribe address, it sends the unsubscribe request from our server at your request. This relay is a voluntary, free additional service and not part of the purchased performance. We may change or discontinue it for good reason, for example security problems, abuse or changed technical conditions, and we announce a discontinuation at least four weeks in advance on glassbird.app and in the release notes. Unsubscribing directly from your computer is not affected.

3. Rights of use and activation

When the licence key is provided, you receive the non-exclusive right, unlimited in time, to use Glassbird Pro with the unlocked features, in the version bought and in all versions you receive under section 9.
Pro licence: it is for one person, on that person's own devices, in up to five Thunderbird profiles at a time (paragraph 5).
Business licence: you receive one key for all seats bought. One person per seat may use it on their own devices, so you may hand it out to as many people as you have bought seats. It can be active in up to five Thunderbird profiles per seat at a time (paragraph 5).
The key holds your name, your email address, the licence ID, the day of the order or issue and the end of the update period, with a Business licence also the plan and the number of seats, with a replacement key also which replacement it is. Glassbird Pro checks it on your computer using a digital signature and activates it with our activation service (paragraph 5); you need no account. You may not bypass the licence check or the activation, or publish the key.
Activation: the licence includes activation with our activation service at glassbird.app/aktivierung. Glassbird Pro activates the key when you enter it and has the activation checked in the background from 30 days after the last successful check. For this your computer needs an internet connection when you enter the key and at least every 90 days after that. Each Thunderbird profile in which you use Glassbird Pro with the key counts as a device of its own. At most five devices can be active at a time, with a Business licence five per seat; a further device can be activated only once a place is free. What the service processes for this is set out in the privacy policy.
Deactivating: you deactivate devices in Glassbird Pro under Settings › License or with your key at glassbird.app/aktivierung. When a device deactivates itself, for example with “Remove license”, its place is free at once. When you deactivate another device in Glassbird Pro, or any device at glassbird.app/aktivierung, its place is free at once as long as there have not already been five such deactivations in the last 92 days, with a Business licence five per seat. Otherwise the place stays taken until the 92nd day after that device's last check, when Glassbird Pro has surely ended there. A device that has not been checked for 92 days frees its place by itself.
Without a check: if no check succeeds for 90 days, for example because your computer is offline that long, Glassbird Pro carries on as the free version, as after the trial. The same applies while your computer's date or time is more than two days behind, and after the clock was set back by more than two days in total, also in several steps, until the next successful check. In both cases your data stays, and the Pro features are back as soon as a check succeeds and the clock is right.
You may pass your licence on to another person, and with a Business licence also individual seats. To the extent you pass it on, you must give up your own use. On request we issue new keys free of charge that keep the end of the update period under section 9; you must then delete the previous key, and we block it so that it can no longer be activated. On devices where it is still entered, remove it beforehand with “Remove license”; otherwise those devices free their place only on the 92nd day after their last check or when they are deactivated under paragraph 6.
Blocking: we block a key or a licence only in these cases: if we have refunded the purchase price in full (section 12), for a refunded renewal only its key; if a payment was charged back and not made good, for example a direct debit or a card payment; if the key is publicly available, for example in a forum; and if we replaced it at your request under paragraph 8. We block by hand only and tell you by email. A blocked key can no longer be activated, and on devices that use it Glassbird Pro carries on as the free version from their next check; your data stays. New versions of Glassbird Pro may also refuse a blocked key without a check. If a key is publicly available, we issue you a new one free of charge that keeps the end of the update period and send it to the email address in the key; your licence remains. If a chargeback is made good or a block was a mistake, we lift it; where a version of Glassbird Pro already published still refuses the key, we issue you a new one free of charge.
End of the service: at least three months before we discontinue the activation service, we provide a version of Glassbird Pro that runs without activation and unlocks the features your key had unlocked by then. You receive it the same way as updates (section 9(5)) and as a download on glassbird.app, even if your update period has already ended. We announce the end of the service together with this version on glassbird.app and in the release notes.
With the companion add-on, Glassbird Pro leaves two settings in your Thunderbird profile by which a reinstall recognises the trial and the device place (privacy policy). Resetting or changing them bypasses the licence check. If you remove Glassbird Pro for good, you may delete them; a new trial in the same profile is not allowed after that.
All other rights in Glassbird Pro remain with us. Included open-source components by other authors are governed by their licences.

4. Free trial

You can try the Pro features free of charge for 30 days, once per Thunderbird profile, also only once after a reinstall (section 3(11)). The trial needs the free companion add-on Glassbird Pro Experiments. The trial ends automatically, puts you under no obligation and is not converted into a purchase.
With a licence key you get the same Pro features as in the trial.

5. Prices and payment

The price shown on the order page immediately before you order applies. At present a Pro licence costs €29.99 and its renewal for twelve months (section 9(4)) €15. All prices are final prices in euros for a one-off payment; there is no subscription and no automatic renewal. As a small business under § 19 of the German VAT Act (UStG), we charge no VAT. There are no shipping costs.
You pay through our payment service provider Stripe (Stripe Payments Europe, Limited, Ireland) by credit or debit card of the brands Visa, Mastercard, American Express, Discover, Diners Club, JCB or UnionPay, with PayPal or by SEPA Direct Debit. With PayPal you sign in to PayPal and confirm the payment there. SEPA Direct Debit requires an account in the SEPA area; you give the direct debit mandate on the payment page. We always charge the price in euros; if your account is held in another currency, your bank, your card issuer or PayPal converts it. The price is due with the order.
Stripe sends you the invoice by email on our behalf.
We only sell to buyers with a billing address in the European Economic Area, that is in the member states of the European Union, Iceland, Liechtenstein and Norway. The order page only offers these countries. If you give a billing address in another country on the payment page, we do not accept your order: you receive no licence key, we refund the amount paid in full without undue delay using the means of payment you paid with, and we tell you so by email.

6. Conclusion of the contract

The information on glassbird.app and in the add-on is not yet a binding offer.
On glassbird.app you choose a licence under “Pricing” and click “Buy”; the buy buttons in Glassbird Pro take you there as well. You reach the order page (glassbird.app/shop/bestellen). It shows you the licence chosen with its main characteristics, its features, its activation and its update period, the price, the payment methods and the sales area. You order a renewal there as well; the settings of Glassbird Pro also take you there. You enter the email address you bought with and your previous licence key or its licence ID, and the order page shows you until when the extended update period runs.
On the order page you enter your name and email address and choose the country of your billing address, for Business also the number of seats. None of the following tick boxes is ticked in advance. With one you agree that we may begin performance immediately and confirm that you thereby lose your right of withdrawal (section 8). With a tick box of its own you expressly and separately agree that you receive updates, including security updates, only during the update period of twelve months and that this deviates from the objective requirements of the law (section 9(3)). With a third you agree that these terms apply. Without all three ticks, the order cannot be sent.
By clicking the button “Order with obligation to pay” you make a binding offer to buy the licence or renewal chosen. We acknowledge receipt of your order by email without undue delay; this acknowledgement is not yet an acceptance. The order page then takes you to Stripe's payment page, where your email address is already filled in. There you enter your billing address and payment details and pay, with PayPal by confirming the payment at PayPal.
Until you click “Order with obligation to pay”, you can check and change all your entries on the order page; you choose a different licence under “Pricing” on glassbird.app. You check and correct your billing address and payment details on the payment page in the fields before you pay. You can cancel by closing the page. The payment page is valid for 31 minutes from your order. If you do not pay by then, the order lapses and no contract is concluded. The same applies if a SEPA Direct Debit is not honoured.
We accept your offer by sending you the contract confirmation with the licence key by email after receipt of payment. This concludes the contract. For billing addresses outside the sales area, section 5(4) applies.
The contract confirmation contains your order details, the wording of your consent to immediate performance (section 8(2)) and of your agreement on the update period (section 9(3)), these terms and the withdrawal information. We keep a copy for six years and send it to you again on request; there is no customer account. You can also retrieve, save and print these terms at any time at glassbird.app/en/agb.html.
You can conclude the contract in German or in English. The English versions of these terms and of the withdrawal information are translations; the German version applies. An English contract confirmation therefore also contains both texts in German. We have not subscribed to any code of conduct.

7. Delivery

As soon as Stripe confirms the payment to us, we send you the contract confirmation with the licence key to the email address you gave when ordering. After that, the page Stripe takes you to after the payment also shows you the key, until 30 days after your order. With card and PayPal this usually happens within a few seconds; with SEPA Direct Debit only after its confirmation, usually after a few working days.
If the email does not arrive or you have lost the key, write to glassbird@dmrc.it. We send it again free of charge to the email address you gave when buying.

8. Right of withdrawal

As a consumer you have a statutory right of withdrawal. Conditions, time limits, the model withdrawal form and the button “Withdraw from contract here” are described in the withdrawal information at glassbird.app/en/widerruf.html.
Your right of withdrawal expires early as soon as we send you the licence key. This requires that you have expressly agreed beforehand on the order page that we begin performing the contract before the withdrawal period ends, that you have acknowledged losing your right of withdrawal, and that we have confirmed the contract to you by email. Without this consent the order page does not let you order.
Once we have sent you the licence key, you can therefore no longer withdraw, even if you have not yet entered the key in Glassbird Pro. Before that, for example while a SEPA Direct Debit has not yet been confirmed, you can withdraw. Your rights in the event of defects (section 10) remain unaffected.
Businesses have no statutory right of withdrawal.

9. Updates

For twelve months from the day of your order (update period) we provide you with all updates to Glassbird Pro at no extra cost: new versions, including new features, security updates, bug fixes and adjustments to new versions of Thunderbird for desktop computers released during this time. We deliver adjustments to a new Thunderbird version within a reasonable period, usually within a few days; until then, features that need the companion add-on may be missing in the new Thunderbird version. The end of the update period is in your contract confirmation and in the settings of Glassbird Pro.
After the end of the update period we owe you no further updates, no security updates, no bug fixes and no adjustments to new Thunderbird versions. You may keep using what you have received by then without time limit. It works with the Thunderbird versions it supports; we do not owe that it also works with Thunderbird versions released later. If Thunderbird still installs newer versions after that, they do not take away any feature your key had unlocked by then; new features in them may require a renewal under paragraph 4. Your rights for defects that Glassbird Pro already had when the licence key or an update delivered during the update period was provided remain unaffected (section 10(2)).
For consumers, this deviates from the objective requirements of the law: under § 327f BGB we must provide updates, including security updates, for the period you can expect given the type and purpose of Glassbird Pro, and this period may be longer than twelve months. The limitation to the update period applies to you only because we informed you specifically of this deviation before your order and you expressly and separately agreed to it on the order page with a tick box of its own (§ 327h BGB). Without this tick the order page does not let you order.
Renewal: you can extend the update period of a Pro licence by twelve months at a time once it has at most twelve months left to run, and also after it has ended. Each renewal is a one-off payment; there is no subscription, and nothing renews without your order. If your update period is still running, the twelve months follow on from its end, so you lose nothing by renewing early. If it has already ended, they begin on the day you order the renewal; you pay nothing for the time in between, and from then on you receive all updates again, including the version current at that time. With the renewal you receive a new licence key with the new end of the update period; it replaces the previous one. Sections 5 to 8 and paragraph 3 apply to the order accordingly. If a renewal is withdrawn from, terminated or refunded, section 12 affects only the renewal; your licence remains with its previous update period.
Thunderbird fetches updates from where you installed Glassbird Pro: from glassbird.app or from addons.thunderbird.net; the companion add-on always comes from glassbird.app. Thunderbird installs them automatically unless you have switched this off. The release notes say what a version changes; we mark security updates there and say what happens if you do not install them.

10. Rights in the event of defects

The statutory rights in the event of defects apply. As a consumer you have the rights for defects of digital products under §§ 327 et seq. of the German Civil Code (BGB), including subsequent performance, price reduction, termination of the contract and damages. For businesses, section 13 applies in addition.
This also applies after the end of the update period: defects that Glassbird Pro already had when the licence key or an update delivered during the update period was provided we remedy under the statutory rules, including through an update; the limitation in section 9 does not affect these rights. If you are a consumer, the following applies to limitation: claims for such defects become time-barred two years after provision; if a defect appears within this period, they do not become time-barred until four months after it first appeared (§ 327j(1) and (4) BGB). Claims for a breach of the obligation to provide updates do not become time-barred until twelve months after the end of the update period (§ 327j(3) BGB).
The easiest way to report errors is to write to glassbird@dmrc.it, with a short description and your Thunderbird version.

11. Liability

We are liable without limitation for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act, for fraudulently concealed defects and to the extent we have given a guarantee.
If we breach through slight negligence an obligation whose fulfilment makes the proper performance of the contract possible in the first place and on whose fulfilment you may regularly rely, we are liable only for the damage that is typical for the contract and foreseeable.
Otherwise we are not liable for slight negligence.
Your rights to subsequent performance, price reduction and termination of the contract remain unaffected.

12. After withdrawal, termination or refund

If you withdraw effectively or terminate the contract because of a defect, we refund the purchase price under the statutory rules using the means of payment you used when buying.
After a withdrawal, a termination of the contract or a full refund of the purchase price, including a goodwill refund, your right of use ends. You may then neither continue to use the unlocked features nor make the key available to others, and you must delete it. We may technically prevent further use by blocking the key or the licence under section 3(9).
The refund does not depend on you deleting the key.

13. Additional terms for businesses

Claims for defects become time-barred one year after the licence key is provided. This does not apply in cases of intent or fraud, where a guarantee has been given, or to damages in the cases of section 11(1).
We owe you updates to the extent described in section 9; the statutory obligation to provide updates to consumers does not apply to you.
For loss of data caused by slight negligence, we are liable only for the effort that would have been needed to restore it if you had backed up your data regularly and appropriately to the risk.

14. Final provisions

The law of the Federal Republic of Germany applies; the UN Convention on Contracts for the International Sale of Goods does not apply. If you are a consumer, this choice of law applies only insofar as it does not deprive you of the protection of mandatory provisions of the state in which you have your habitual residence.
How we process your data when you buy is described in the privacy policy (glassbird.app/en/privacy.html).

As of November 2026