I was recently asked by a third party to tighten the way contribution IP/license is handled with Py4J[1] and found this service, which looks painless for contributors.<p>I've been burned in the past by having to physically sign and scan or fax (!) contributor license agreements and I did not want to impose this additional hassle to potential contributors. Anybody has experience with this particular service or other alternatives?<p>[1] <a href="https://www.py4j.org/" rel="nofollow">https://www.py4j.org/</a>