This package is licensed under GPLv2 only but links with the OpenSSL library which makes it impossible for distribution as the licenses are incompatible. See https://www.gnu.org/licenses/license-list.html#OpenSSL https://people.gnome.org/~markmc/openssl-and-the-gpl.html You either have to ask the copyright holders to release it under GPL + OpenSSL exception or modify it to link with another cryptographic library such as GnuTLS.
OpenSSL is considered as a system library so there should no license restriction, see #924937. OpenSSL 3 in experimantal is licensed under the Apache-2 license. Sebastian