v1.2.1

Added

• Support SignedDrmCertificate and SignedMessages messages in Cdm.encrypt_client_id(). This is mainly as a
  convenience for any scripts wanting to encrypt their Client ID with a service certificate manually.
• All License Keys from Serve's /keys endpoint can now be received by providing ALL as the key type.
  • This adds support for systems needing more than two types of keys from the license, e.g., Netflix MSL.
  • For faster response times it is best to still ask for only CONTENT keys if that's all you need.
• Serve now has a /close endpoint to close a session. All clients should close the session once they are finished
  with it or the user will eventually hit a limit of 50 sessions per user and the server will hog memory til it
  restarts.
• Serve now verifies that all Devices in config actually exist before starting the server.
• Serve now responds with a Server header denoting that pywidevine serve is being used, and it's version.
  • This allows Clients to selectively support APIs based on version; verify the API as being supported.

Changed

• Lessened version pin on lxml from ^4.9.1 to >=4.8.0 to support projects using pycaption.
• Service Certificate is now saved in the session as a SignedMessage with a SignedDrmCertificate instead of the raw
  DrmCertificate. The SignedMessage is unsigned as the SignedDrmCertificate within it, is signed. This is so
  anything inheriting or using the Cdm (e.g., serve) can verify the certificate down the chain and keep it signed.
• Serve now constructs one Cdm object for each user+device combination so one user cannot fill or overuse the CDM
  session limit.
• All of Serve's endpoints now have a /{device} prefix. E.g., instead of /challenge/STREAMING, it's now
  /device_name/challenge/STREAMING. This is to support the previous change.

Fixed

• Handle server crash when the session limit is reached in Serve's /open endpoint by returning a 400 error.
• Serve now correctly updates (or rather now makes a new Cdm object) if a user switches from one Device to another.
  • Previously it would reuse an existing Cdm object, but would forget to switch device if they changed.
  • Note: It does still leave the previous Cdm with the older Device in memory.
• Handle IOError when parsing bytes as MP4 Box to allow arbitrary data to be made as new boxes in PSSH.get_as_box().