[sagher]

I don't know of any specific licensing terms but I'm sure you can find them on oracle's website.
I believe you already have the open version (openjdk & openjre) of JAVA which does not require a license.  You can verify this by your output of  $java -version 

What command are you using to install the .deb, and what is the output?

i download the file. and paste it into /tmp folder . and give this command via ssh

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sudo dpkg -i /tmp/jdk-15.0.2_linux-x64_bin.deb

and the output is :

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Selecting previously unselected package jdk-15.0.2.
(Reading database ... 47584 files and directories currently installed.)
Preparing to unpack .../jdk-15.0.2_linux-x64_bin.deb ...
Unpacking jdk-15.0.2 (15.0.2-1) ...
Setting up jdk-15.0.2 (15.0.2-1) ...

Just in 10sec. is it all done ?