May I develop commercial application base on jain-sip src?

[Ryan-YY]

As stated in the title,may I develop commercial application base on jain-sip src? Caus the JSIP-Spec-license confused me as below: "For the purposes of this Agreement: "Independent Implementation" shall mean an implementation of the Specification that neither derives from any of Sun's or BEA’s source code or binary code materials nor, except with an appropriate and separate license from Sun or BEA, as applicable, includes any of Sun's or BEA’s source code or binary code materials;"

  Please let me know if you have any opinion.
  Thanks very much.