SQLULDR2 is not full free for extrading rows to text file from Oracle database. The ociuldr is still free, but SQLULDR2 is stronger than ociuldr, both in performance and features. If you want to extract huge table (tens of gigabytes table) to flat file, you should use SQLULDR2 to get better performance, it provide almost the same speed as Oracle export utility.
If you don't register it, you can just extract less than 500000 rows per query. And you cannot output the rows to screen (STDOUT) for pipe operation, and it will not generate the Oracle SQL * Loader (sqlldr) control file for you. By default it's a restricted version.
D:>sqluldr2
SQL*UnLoader: Fast Oracle Text Unloader Release 3.0.0
(@) Copyright Lou Fangxin 2004/2008, all rights reserved.
Unregisted, maximum 500000 rows, restricted version.
Usage: SQLULDR2 keyword=value [,keyword=value,...]
......
If you buy a permanent license, and tell SQLULDR2 the key file location of with key command line option, it becomes a full version without any restriction.
D:\>sqluldr2 key=anysql.key
SQL*UnLoader: Fast Oracle Text Unloader Release 3.0.0
(@) Copyright Lou Fangxin 2004/2008, all rights reserved.
Registered, licence grant to LouFangxin, full version.
Usage: SQLULDR2 keyword=value [,keyword=value,...]
......
Price for each license is 100 USD. Do you want to upgrade?