Description of problem:
Package decription in some packages is corrupted when the package is downloaded via satellite-sync from RHN. Otherwise when the package is downloaded from RHN using WEB-UI and then imported to Satellite via rhnpush, there is no problem with package description encoding. 
I tried download and import the package as I described and then created new channel for testing purposes in Satellite, I imported the recently imported package into the channel and created channel dump via satellite-exporter. After that I imported this dump to Satellite via satellite-sync and the result was okay. This problem occurs only when the package is downloaded from RHN via satellite-sync.
In next step I deleted the package with corrupted desctiption from Satellite database and '/var/satellite/redhat/NULL/*/checkpolicy/' and I also deleted '/var/cache/rhn/satsync/packages/'. Then I started satellite-sync and it downloaded the missing package from RHN. The '/var/cache/rhn/satsync/packages/' contained only one directory and one cache file in it.
So I looked into the code to the part where the data are unpacked. Specifically in rhnCache.py.  
I made patch for rhnCache.py and now you can see the data we are recieving from RHN.

Version-Release number of selected component (if applicable):
Satellite 5.7

How reproducible:
Every time

Steps to Reproduce:
1. Apply the patch for rhnCache.py
2. Sync channel which contains package 'checkpolicy' via satellite-sync. In my case 'rhel-i386-server-5.0.z'.
3. Take a look into '/var/log/rhn/rhn_server_satellite.log' and search for 'checkpolicy description'.
4. This output shows the package description entry from the variable which contains the decompressed cachefile.

Actual results:
Package description encoding is corrupted near registered trademark symbol. 

Expected results:
Satellite-sync should get the "cachefile" with non-corrupted encoding. 

Additional info:
If you want to resync channel to see the output for the specific package, you can use commands listed below to delete the package from database. Also do not forget to delete the package from the '/var/satellite/redhat/NULL/*/checkpolicy'.

echo "delete from rhnchannelpackage where package_id=(select id from rhnpackage where name_id=(select id from rhnpackagename where name like '%checkpolicy%'));" | spacewalk-sql -i
echo "delete from rhnpackage where id=(select id from rhnpackage where name_id=(select id from rhnpackagename where name like '%checkpolicy%'));" | spacewalk-sql -i

Package description itself is unharmed. You can check it there: 'rpm -qip /var/satellite/redhat/NULL/cf2/checkpolicy/*/*/*/*.rpm'

Does not matter for which architecture the package is designed. Description of the package is the same for all architectures.

This problem does not affect only the package "checkpolicy"!

Patch:

30a31,36
> from spacewalk.common.rhnLog import initLOG
> from spacewalk.common.rhnConfig import CFG, initCFG, PRODUCT_NAME
> initCFG('server.satellite')
> initLOG(CFG.LOG_FILE, CFG.DEBUG)
> from spacewalk.satellite_tools.syncLib import log, log2, log2disk, log2stderr, log2email
> 
356c362,367
<             return cPickle.loads(pickled)
---
>             tempvar = cPickle.loads(pickled)
>             if tempvar.data.get('name')=='checkpolicy' and tempvar.data.get('description'):
>                 log(1, ("following data are from : %s") % name)
>                 log(1, ("checkpolicy description: %s") % tempvar.data.get('description'))
> 
>             return tempvar
405a417
>