Document:

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                                                                    EXHIBIT 10.3
                                                                    ------------

                               AMENDMENT NO. 1 TO
                              AMENDED AND RESTATED
                      SERIES B CONVERTIBLE PREFERRED STOCK
                         AND WARRANT PURCHASE AGREEMENT

         This Amendment No. 1, dated as of May 31, 2002 (this "AMENDMENT"), to
the Amended and Restated Series B Convertible Preferred Stock and Warrant
Purchase Agreement, dated as of March 18, 2002 (the "AGREEMENT"), is among
Penton Media, Inc., a Delaware corporation (the "COMPANY"), and the Purchasers
(as defined in the Agreement).

         Pursuant to the Agreement, the Company sold to the Purchasers 50,000
shares of the Company's Series B Convertible Preferred Stock, par value $.01 per
share (the "PREFERRED STOCK"), and warrants to purchase 1,600,000 shares of the
Company's common stock, par value $.01 per share.

         The Company and the Purchasers have determined that it would be
advisable and in the best interests of the Company and its stockholders to amend
the terms of the Preferred Stock to eliminate the scheduled redemption feature
of the Preferred Stock to address the adverse accounting treatment related to
this feature of the Preferred Stock in exchange for granting the Purchasers the
right to cause the sale of the Company under certain circumstances.

         Section 13.6 of the Agreement provides that the Agreement may be
amended if such amendment is in writing and is signed by the Company and each of
the Purchasers.

         In consideration of the mutual promises and covenants set forth in this
Agreement, the parties hereto agree as follows:

         1. Capitalized terms used but not otherwise defined herein will have
the meanings set forth in the Agreement.

         2. Promptly upon receipt of the required stockholder approval, the
Company shall file the Amended Certificate of Designations, attached hereto as
EXHIBIT A (the "AMENDED CERTIFICATE OF DESIGNATIONS"), designating the rights
and preferences of the Preferred Stock.

         3. The Agreement is hereby amended to add the following new Section
9.9(e):

            (e) From and after the 6th anniversary of the Initial Closing Date,
            the holders of a majority of the Series B Shares then outstanding
            shall have the right to cause the Company to seek a buyer for all of
            the assets or issued and outstanding capital stock of the Company,
            and such sale will be conducted in accordance with the procedures
            set forth in this Section 9.9 (other than Section 9.9(d)); PROVIDED,
            HOWEVER, the rights set forth in this Section 9.9(e) shall not be
            effective if less than 3,500 Series B Shares (subject to adjustment
            to reflect any stock split, stock dividend, reclassification or
            other transaction having a similar effect) are then outstanding.

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         4. Unless otherwise required by applicable law (i) each of the
Purchasers shall report the amendment of the terms of the Preferred Stock as a
tax-free exchange on all relevant Tax returns and (ii) neither the Company nor
the Purchasers shall treat the Series B Preferred Stock as "preferred stock"
within the meaning of Section 305 of the Code.

         5. In consideration for the Purchasers' execution and delivery of the
Amendment and for agreeing to an amendment to the terms of the Preferred Stock,
and in addition to all of the Company's other obligations under the Agreement
and Amendment, the Company shall defend, protect, indemnify and hold harmless
the Indemnitees from and against any and all Indemnified Liabilities, including,
but not limited to, any Tax liabilities (including any Tax imposed on such
Indemnitee as a result of any payment to that Indemnitee under this Section 5),
incurred by the Indemnitees or any of them as a result of, or arising out of, or
relating to (i) the execution, delivery, performance or enforcement of the
Amendment or (ii) the amendment to the terms of the Preferred Stock, as
contemplated in the Amended Certificate of Designations, to remove the scheduled
redemption date. The indemnification rights set forth in this Section 5 are
subject to the procedures set forth in Article XII of the Agreement.
Notwithstanding this Section 5 or Article XII of the Agreement, no Person shall
have any rights to indemnification with respect to any loss arising solely from
or related solely to the covenant set forth in clause (ii) of Section 4 of this
Amendment.

         6. The Amendment shall bind and inure to the benefit of the parties
hereto and their respective successors and assigns, including each subsequent
holder of Preferred Stock, Warrants, Conversion Shares or Warrant Shares. Except
as otherwise specifically provided herein, this Amendment shall not be
assignable by any party without the prior written consent of the other parities
hereto; provided, however, that each Purchaser shall be entitled to assign its
rights and obligations under this Amendment to any transferee of the Series B
Shares without the consent of any other party hereto so long as (i) the transfer
of such Series B Shares to such transferee is made in accordance with Sections
6.4 and 13.2 of the Agreement and (ii) such transferee agrees in writing to be
bound by the terms of the Agreement and this Amendment. Except as specifically
set forth or referred to herein, nothing herein is intended or shall be
construed to confer upon any person or entity other than the parties hereto and
their successors or assigns, any rights or remedies under or by reason of this
Amendment.

         7. This Amendment may be executed in any number of counterparts, each
of which shall be deemed to be an original, but all of which together shall
constitute one agreement.

         8. THIS AMENDMENT SHALL BE GOVERNED BY, CONSTRUED IN ACCORDANCE WITH,
AND ENFORCED UNDER, THE LAW OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS OR
INSTRUMENTS ENTERED INTO AND PERFORMED ENTIRELY WITHIN SUCH STATE.

         9. If any term, provision, covenant or restriction of this Agreement is
held by a court of competent jurisdiction to be invalid, void or unenforceable,
the remainder of the terms, provisions, covenants and restrictions of this
Agreement shall remain in full force and effect and shall in no way be affected,
impaired or invalidated.

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         10. Except as otherwise provided herein, the remedies provided herein
shall be cumulative and shall not preclude the assertion by any party hereto of
any other rights or the seeking of any other remedies against any other party
hereto.

         11. The Agreement, the Related Documents, the Confidentiality
Agreement, the Amended Certificate of Designations for the Preferred Stock and
this Amendment and each other writing referred to herein or therein or delivered
pursuant hereto or thereto constitute the entire agreement among the parties
with respect to the subject matter hereof and supersede all prior arrangements
or understandings, including, without limitation, the Original Agreement.

         12. The Company acknowledges that pursuant to Section 13.5(a) of the
Agreement, the Company shall reimburse the Purchasers for all reasonable
expenses and costs (including all reasonable attorneys fees) incurred in
connection with the negotiation and execution of this Amendment, the Amended
Certificate of Designations and any of the related documents.

                      [SIGNATURES BEGIN ON FOLLOWING PAGE]

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         IN WITNESS WHEREOF, the parties have executed this Amendment No. 1 to
the Amended and Restated Series B Convertible Preferred Stock and Warrant
Purchase Agreement as of the day and year first above written.

                               PENTON MEDIA, INC.

                               By:     /s/ Preston L. Vice
                                       ---------------------------------------
                               Name:   Preston L. Vice
                               Title:  Senior Vice President and Secretary

                               ABRY MEZZANINE PARTNERS L.P.

                               By:      ABRY Mezzanine Investors, L.P.,
                                        its general partner

                               By:      ABRY Mezzanine Holdings, LLC,
                                        its general partner

                               By:   /s/ Peni Garber
                                     ------------------------------------------
                               Name:  Peni Garber
                               Title: Clerk

                               ABACUS MASTER FUND, LTD.

                               By:    /s/ Douglas Banks
                                      ------------------------------------------
                               Name:  Douglas Banks
                               Title: Director

                                      -4-
<PAGE>

                       SANDLER CAPITAL PARTNERS V, L.P.

                       By:    Sandler Investment Partners, L.P., General Partner
                       By:    Sandler Capital Management, General Partner
                       By:    MJDM, Corp., General Partner

                       By:    /s/ Moira Mitchell
                          --------------------------------
                       Name: Moira Mitchell
                       Title: President

                       SANDLER CAPITAL PARTNERS V FTE, L.P.

                       By:    Sandler Investment Partners, L.P., General Partner
                       By:    Sandler Capital Management, General Partner
                       By:    MJDM, Corp., General Partner

                       By:    /s/ Moira Mitchell
                          --------------------------------
                       Name: Moira Mitchell
                       Title: President

                       SANDLER CAPITAL PARTNERS V GERMANY, L.P.

                       By:    Sandler Investment Partners, L.P., General Partner
                       By:    Sandler Capital Management, General Partner
                       By:    MJDM, Corp., General Partner

                       By:    /s/ Moira Mitchell
                          --------------------------------
                       Name: Moira Mitchell
                       Title: President

                                      -5-<PAGE>

                                                                     EXHIBIT 4.1

                AMENDMENT NO. 4 TO CREDIT AND SECURITY AGREEMENT
                ------------------------------------------------

         This Amendment No. 4 to Credit and Security Agreement ("Amendment
No. 4") dated effective as of the 29 day of April, 2002, by and between COHESANT
TECHNOLOGIES INC., a Delaware corporation (hereinafter referred to as
"Borrower"), and UNION PLANTERS BANK, N.A. a national banking association
(hereinafter referred to as "Bank").

                              W I T N E S S E T H :

         WHEREAS, the Borrower and the Bank are parties to that certain Credit
and Security Agreement dated as of the 15th day of May, 1998, as amended by that
certain Amendment No. 1 to Credit and Security Agreement dated April 13, 1999,
as further amended by that certain Amendment No. 2 to Credit and Security
Agreement dated April 17, 2000, and as further amended by that certain Amendment
No. 3 to Credit and Security Agreement dated April 1, 2001 (hereinafter referred
to as "Agreement"); and

         WHEREAS, the Borrower desires to renew and amend the financial
accommodations previously extended by the Bank; and

         WHEREAS, the Bank is willing to provide such financial accommodations
to the Borrower on the terms and subject to the conditions in the Agreement as
amended by the terms and conditions of this Amendment No. 4.

         NOW, THEREFORE, in consideration of the premises, the mutual covenants
hereinafter contained, and other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties agree as follows:

         SECTION 1. EFFECT OF THIS AMENDMENT NO. 4. This Amendment No.4 shall
not change, modify, amend or revise the terms, conditions and provisions of the
Agreement, the terms and provisions of which are incorporated herein by
reference, except as expressly provided herein and agreed upon by the parties
hereto. This Amendment No. 4 is not intended to be nor shall it constitute a
novation or accord and satisfaction of the outstanding instruments by and
between the parties hereto. Borrower and Bank agree that, except as expressly
provided herein, all terms and conditions of the Agreement shall remain and
continue in full force and effect. The Borrower acknowledges and agrees that the
indebtedness under the Agreement remains outstanding and is not extinguished,
paid, or retired by this Amendment No. 4, or any other agreements between the
parties hereto prior to the date hereof, and that Borrower is and continues to
be fully liable for all obligations to the Bank contemplated by or arising out
of the Agreement. Except as expressly provided otherwise by this Amendment No.
4, the credit facilities contemplated by this Amendment No. 4 shall be made
according to and pursuant to all conditions, covenants, representations and
warranties contained in the Agreement.

         SECTION 2. DEFINITIONS. Terms defined in the Agreement which are used
herein shall have the same meaning as set forth in the Agreement unless
otherwise specified herein.

                                      -1-
<PAGE>

         SECTION 3. AMENDMENT OF AGREEMENT. Subject to the satisfaction of the
conditions precedent set forth in Section 5 herein:

         (a) The first sentence of Subsection 2.1.1 of the Agreement is hereby
amended and replaced with the following:

         2.1.1 The obligation of the Borrower to repay the Line of Credit Loans
         shall be evidenced by the Line of Credit Note which shall be repayable
         on or before May 1, 2003 ("Maturity").

         (b) Borrower and Bank have agreed that the repayment of the Loans and
any other indebtedness or other obligations of the Borrower to the Bank shall,
effective as of the date of this Amendment No. 4, be unsecured. Accordingly,
Section 4 of the Agreement and any other references to collateral security
appearing within the Agreement are hereby deleted in their entirety.

         (c) Sections 6.4, 6.14, 7.10 and 13.3 of the Agreement are hereby
deleted in their entirety.

         (d) Section 7.12.2 of the Agreement is hereby amended and restated in
its entirety as follows:

         7.12.2   RATIO OF TOTAL LIABILITIES TO TANGIBLE NET WORTH. Maintain a
                  ratio of Total Liabilities to Tangible Net Worth at all times
                  in an amount not to exceed 1.00:1.00.

         SECTION 4. CONDITIONS PRECEDENT. This Amendment No.4 shall become and
be deemed effective in accordance with its terms immediately upon the Bank
receiving:

                  (a) Two (2) copies of this Amendment No. 4 duly executed by
         the authorized officers of the Borrower and the Bank.

                  (b) One (1) copy of the Line of Credit Note reflecting the
         revised Maturity duly executed by an authorized officer of the
         Borrower.

                  (c) Two (2) copies of a Consent and Confirmation of Guaranty
         executed by each of the Guarantors.

                  (d) Certificates of Existence regarding Borrower and
         Guarantors issued by the appropriate Secretary of State's Office.

                  (e) Two (2) copies of a Termination of Collateral Agreements
         executed by the duly authorized officers of the Borrower, the
         Guarantors and the Bank.

                  (f) Two (2) copies of an Officer's Certificate Regarding
         Resolutions and Incumbency of Borrower.

                  (g) Such other documents and items as the Bank may reasonably
         request.

         SECTION 5. REPRESENTATIONS AND WARRANTIES OF THE BORROWER. The Borrower
hereby represents and warrants, in addition to any other representations and
warranties contained herein, in the Agreement, the Loan Documents (as defined in
the Agreement) or any other document, writing or statement delivered or mailed
to the Bank or its agent by the Borrower, as follows:

                                      -2-
<PAGE>

                  (a) This Amendment No. 4constitutes a legal, valid and binding
         obligation of the Borrower enforceable in accordance with its terms.
         The Borrower has taken all necessary and appropriate corporate action
         for the approval of this Amendment No. 4 and the authorization of the
         execution, delivery and performance thereof.

                  (b) As of the date hereof, there is no Event of Default or
         Default under the Agreement, the Amendment No. 4 or the Loan Documents.

                  (c) The Borrower hereby specifically confirms and ratifies its
         obligations, waivers and consents under each of the Loan Documents.

                  (d) Except as specifically amended herein, all
         representations, warranties and other assertions of fact contained in
         the Agreement and the Loan Documents continue to be true, accurate and
         complete.

                  (e) There have been no changes to the Articles of
         Incorporation, By-Laws, or the composition of the Board of Directors of
         the Borrower since execution of the Agreement.

                  (f) Borrower acknowledges that the definition "Loan Documents"
         shall include this Amendment No. 4 and all the documents executed
         contemporaneously herewith.

         SECTION 6. AFFIRMATIVE COVENANTS. By entering into this Amendment No.
4, Borrower further specifically undertakes to comply with the obligations,
terms and covenants as contained in the Agreement and agrees to comply therewith
as such relate to the credit facilities and accommodations as provided to the
Borrower pursuant to the terms of this Amendment No. 4.

         SECTION 7. GOVERNING LAW. This Amendment No. 4 has been executed and
delivered and is intended to be performed in the State of Indiana and shall be
governed, construed and enforced in all respects in accordance with the
substantive laws of the State of Indiana.

         SECTION 8. HEADINGS. The section headings used in this Amendment No. 4
are for convenience only and shall not be read or construed as limiting the
substance or generality of this Amendment No. 4.

         SECTION 9. SURVIVAL. All representations, warranties, and covenants of
the Borrower herein or any certificate, agreement or other instrument delivered
by or on its behalf under this Amendment No. 4 shall be considered to have been
relied upon by the Bank and shall survive the making of the Loans and delivery
to the Bank of the Line of Credit Note. All statements and any such certificate
or other instrument shall constitute warranties and representations hereunder by
the Borrower, as the case may be.

         SECTION 10. COUNTERPARTS. This Amendment No. 4 may be signed in one or
more counterparts, each of which shall be considered an original, with the same
effect as if the signatures were upon the same instrument.

         SECTION 11. MODIFICATION. This Amendment No. 4 may be amended,
modified, renewed or extended only by written instrument executed in the manner
of its original execution.

         SECTION 12. WAIVER OF CERTAIN RIGHTS. The Borrower waives acceptance or
notice of acceptance hereof and agrees that the Agreement, this Amendment No. 4,
the Line of Credit Note, and all of the other Loan Documents shall be fully
valid, binding, effective and enforceable as of the

                                      -3-
<PAGE>

date hereof, even though this Amendment No. 4 and any one or more of the other
Loan Documents which require the signature of the Bank, may be executed by and
on behalf of the Bank on other than the date hereof.

         SECTION 13. WAIVER OF DEFENSES AND CLAIMS. In consideration of the
financial accommodations provided to the Borrower by the Bank as contemplated by
this Amendment No. 4, Borrower hereby waives, releases and forever discharges
the Bank from and against any and all rights, claims or causes of action against
the Bank arising under the Bank's actions or inactions with respect to the Loan
Documents or any security interest, lien or collateral in connection therewith
as well as any and all rights of set off, defenses, claims, causes of action and
any other bar to the enforcement of the Loan Documents which exist as of the
date hereof.

         IN WITNESS WHEREOF, COHESANT TECHNOLOGIES INC. and UNION PLANTERS BANK,
N.A. have caused this Amendment No. 4 to Credit and Security Agreement to be
executed by their respective duly authorized officers effective as of the 29 day
of April, 2002.

                                       COHESANT TECHNOLOGIES INC.

                                       ("Borrower")

                                       By:_____________________________________

                                       Printed:________________________________

                                       Title:__________________________________

                                       UNION PLANTERS BANK, N.A.

                                       ("Bank")

                                       By:_____________________________________
                                          Janet K. Carter, Vice President

                                      -4-

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