• you communicate some notices (including the warranty disclaimer)
• and you do not infringe authors' trademarks.

This is a "Free Software" license, but it is not a "copyleft" license. When you distribute copies, you may change license terms and restrictions, keep derivative works to yourself, or choose to charge a fee, for example. You do not have to pay us for these freedoms.

Software from a different source may have been modified (in which case they should not be calling it librock, which is a trademark only we can apply.) There could be additional license terms and restrictions not under our control.

• Digitally signed license certificates. This is a legally irrefutable assurance of the software license. It is dated, mentions the subscriber by name, and lists which files are provided under the license with their md5 checksums.

  Since we do not "sell" software licenses or require royalties, there is no accounting trail which can prove a license. We provide license certificates instead. This is a statement that "yes, you have the legal permission from us to make and distribute copies." [More about this]

• Integrity Check for Downloaded Software. The md5 checksums in the license certificate can be used to do an integrity check that the source code you have matches our master sources. This will detect tampering with the sources, either at our or your copies. It easy to check all the files as a batch, since the license certificate is provided in a format compatible with the gmd5sum utility (from the GNU project) [More about this]
• Functional Quality Assurance. Files which pass the regression test suite are listed in a digitally signed test certificate available to subscribers only.
• Low-traffic email list for important notifications.
• Subscriber download area, with incremental update and subsetting features using httpsync.
• Priority handling for email, feature requests, and defect submissions. (We accept reports and submissions from all users, but subscriber requests get priority.)