In order for your product to be compliant with the requirements of LGPL, we suggest that you do all of the following:
1. With regards to redistribution of FFmpeg:
- If you redistribute FFmpeg unmodified, you must accompany it with the appropriate copyright notice and disclaimer of warranty; you must retain all notices; and you must distribute a copy of the LGPL along with the file.
- If you distribute a version of FFmpeg modified by you, you must comply with all steps provided for in the previous paragraph. In addition, you must ensure that your modified file is also a library, you must include a detailed change-log, and you must not charge a royalty for the modified file.
- In either case, you must include with your distribution all of the source code for the LGPL-licensed files. If you distribute the LGPL-licensed files by electronic download, then you may offer to download the source codes from the same place where your application is distributed. It is a requirement of LGPL v.2.1 that source code is hosted on the same server. Alternatively, you may provide a written offer (which must be valid for at least three years from the date of distribution) to provide the complete source code. You must not charge any money for providing source code, except your reasonable costs (for example, mailing costs) of providing the source code.
- For your convenience, the folder found in our product's setup folder includes: a) FFmpeg's source code (in the form used to compile the DLLs in our product); b) the text of the LGPL license version 2.1; and c) compilation details (in the archive with the source codes).
2. Add the following text to every page in your website where there is a download link to your application:This software uses code of FFmpeg licensed under the LGPL version 2.1 and its source can be downloaded here.
See our own web page
as an example.
3. Mention "This software uses libraries from the FFmpeg project under the LGPL version 2.1." in the "about box" of your software.
4. Mention in your EULA that your program uses FFmpeg under the LGPL version 2.1.
5. If your EULA claims ownership over the code, you have to explicitly mention that you do not own FFmpeg, and where the relevant owners can be found.
6. Remove any prohibition of reverse engineering from your EULA.
Other important notes:
- Do not misspell FFmpeg (caps for "FF" and lowercase for "mpeg").
- Do not rename FFmpeg's DLLs.
Please also note that, although we do test whether our products work with newer versions of FFmpeg from time to time (this requirement is an important part of the LGPL license), we don't recommend replacing our own builds with newer ones simply because our own builds are being tested more thoroughly.