Question: Is application signing mandatory in S60 3rd Edition?
Answer: Yes, application signing is mandatory. Note that applications can be developer-signed, because Symbian Signed is not mandatory in S60 3rd Edition. An application can be signed with a developer-created certificate, which is created with the MakeKeys utility included in the S60 3rd Edition SDKs. If an application needs to gain access to certain Symbian OS platform security capabilities that are not user-grantable or certain market channels, it must instead be Symbian Signed.
More about Platform Security, Symbian Signed and certification can be found from the brand new Platform Security section in Forum Nokia. Just browse it at
Forum Nokia -> Platforms -> S60 Platform -> Platform Security.