6. Your account and license
To use many features of Jagex Products, we require you to create an Account and, in relation to some platform versions of Jagex Products, download and/or, install certain authorised software on your device. You may be required to create an Account before downloading and installing any software. We grant valid Account holders a non-exclusive,
non-transferable
, non-sub-licensable, personal, limited license, which can be revoked at any time, to access and use the Jagex Products and (as applicable) to download and use our software and install the Jagex Products on a device and to connect to our servers solely to use Jagex Products for personal and non-commercial purposes and subject at all times to your strict compliance with these Terms. To be clear, we consider the creation of an Account in order to access any authorised software in order to understand, decompile, reverse engineer, copy, reproduce, or transmit such authorised software as being outside the scope of “personal and non-commercial use”
Taken from the Rules.
Text in Red will help you out.
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Source - https://www.jagex.com/en-GB/terms